<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .container{
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            grid-template-rows: repeat(5, 1fr);
            max-width: 1200px;
            margin: 0 auto;
            gap: 10px;
        }
        .item{
            width: 100%;
            height: 100%;
            line-height: 100px;
            text-align: center;
            background-color: pink;
            margin-top: 50px;
        }
        .item:nth-child(1){
            grid-column: 1 / 3;
            grid-row: 1 / 3;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="item">1</div>
        <div class="item">2</div>
        <div class="item">3</div>
        <div class="item">4</div>
        <div class="item">5</div>
        <div class="item">6</div>
        <div class="item">7</div>
        <div class="item">8</div>
        <div class="item">9</div>
        <div class="item">10</div>
        <div class="item">11</div>
        <div class="item">12</div>
        <div class="item">13</div>
        <div class="item">14</div>
        <div class="item">15</div>
        <div class="item">16</div>
        <div class="item">17</div>
        <div class="item">18</div>
        <div class="item">19</div>
        <div class="item">20</div>
    </div>
</body>
</html>